42 lines
955 B
C
42 lines
955 B
C
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/*
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* arch/sh64/kernel/led.c
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*
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* Copyright (C) 2002 Stuart Menefy <stuart.menefy@st.com>
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*
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* May be copied or modified under the terms of the GNU General Public
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* License. See linux/COPYING for more information.
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*
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* Flash the LEDs
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*/
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#include <linux/config.h>
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#include <linux/stddef.h>
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#include <linux/sched.h>
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void mach_led(int pos, int val);
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/* acts like an actual heart beat -- ie thump-thump-pause... */
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void heartbeat(void)
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{
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static unsigned int cnt = 0, period = 0, dist = 0;
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if (cnt == 0 || cnt == dist) {
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mach_led(-1, 1);
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} else if (cnt == 7 || cnt == dist + 7) {
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mach_led(-1, 0);
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}
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if (++cnt > period) {
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cnt = 0;
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/*
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* The hyperbolic function below modifies the heartbeat period
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* length in dependency of the current (5min) load. It goes
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* through the points f(0)=126, f(1)=86, f(5)=51, f(inf)->30.
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*/
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period = ((672 << FSHIFT) / (5 * avenrun[0] +
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(7 << FSHIFT))) + 30;
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dist = period / 4;
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}
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}
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